Fix premature truncation of brief descriptions in Doxygen comments.

Don't end the brief description at the first period if it's a period which is
part of "i.e." or "e.g.": escape the space following it to prevent Doxygen
from recognizing it as an end of sentence.

See #14866.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73084 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/thread.h

@@ -1092,7 +1092,7 @@ public:
     /**
         Gets the thread identifier: this is a platform dependent number that uniquely
         identifies the thread throughout the system during its existence
-        (i.e. the thread identifiers may be reused).
+        (i.e.\ the thread identifiers may be reused).
     */
     wxThreadIdType GetId() const;
 
@@ -1123,7 +1123,7 @@ public:
     unsigned int GetPriority() const;
 
     /**
-        Returns @true if the thread is alive (i.e. started and not terminating).
+        Returns @true if the thread is alive (i.e.\ started and not terminating).
 
         Note that this function can only safely be used with joinable threads, not
         detached ones as the latter delete themselves and so when the real thread is